Heat storage capsule and heat storage member using the same

Abstract

A heat storage capsule 10 includes a heat storage material 20 reversibly changing into a hydrate of a salt and an aqueous solution of the salt and also includes a capsule coating 22 encapsulating the heat storage material 20. The capsule coating 22 includes an inner sub-coating 24 and an outer sub-coating 26. The inner sub-coating 24 is a hydrogenated oil layer. The outer sub-coating 26 is made of a hydrophilic gel. The heat storage capsule 10 has a W/O/W three-layer structure.

The invention claimed is: 
     
       1. A heat storage member comprising:
 a container; 
 a double-network gel or a nano-composite gel filled in the container; and 
 a plurality of heat storage capsules which are dispersed in the double-network gel or the nano-composite gel and which each include a heat storage material reversibly changing into a hydrate of a salt and an aqueous solution of the salt and a capsule coating encapsulating the heat storage material; wherein 
 the double-network gel includes an interpenetrating polymer network structure in which network structures made of different materials are physically intertwined with each other, 
 the nano-composite gel is defined by a polymer cross-linked with inorganic nanoparticles, 
 the capsule coating includes an inner sub-coating covering the heat storage material and an outer sub-coating covering the inner sub-coating, 
 the inner sub-coating is a hydrogenated oil layer and the outer sub-coating is made of a calcium alginate gel. 
 
     
     
       2. A heat storage member comprising:
 a container; 
 a double-network gel or a nano-composite gel filled in the container; and 
 a plurality of heat storage capsules which are dispersed in the double-network gel or the nano-composite gel and which each include a heat storage material reversibly changing into a hydrate of a salt and an aqueous solution of the salt and a capsule coating encapsulating the heat storage material; wherein 
 the double-network gel includes an interpenetrating polymer network structure in which network structures made of different materials are physically intertwined with each other, 
 the nano-composite gel is defined by a polymer cross-linked with inorganic nanoparticles, 
 the capsule coating includes an inner sub-coating covering the heat storage material and an outer sub-coating covering the inner sub-coating, 
 the inner sub-coating is made of a double-network gel. 
 
     
     
       3. A heat storage member comprising:
 a container; 
 a double-network gel or nano-composite gel filled in the container; and 
 a plurality of heat storage capsules which are dispersed in the double-network gel or the nano-composite gel and which each include a heat storage material reversibly changing into a hydrate of a salt and an aqueous solution of the salt and a capsule coating encapsulating the heat storage material; wherein 
 the double-network gel includes an interpenetrating polymer network structure in which network structures made of different materials are physically intertwined with each other, 
 the nano-composite gel is defined by a polymer cross-linked with inorganic nanoparticles, 
 the capsule coating includes an inner sub-coating covering the heat storage material and an outer sub-coating covering the inner sub-coating, 
 the outer sub-coating is made of a nano-composite gel.